Root Zone KSK Rollover: Technical Updates
19 September 2016 – First step of 2017 KSK Rollover External Test Plan completed
The 2017 KSK Rollover External Test Plan [PDF, 516 KB] describes different tests of DNS resolvers that will help plan for the Root Zone KSK rollover. Part of that test plan says:
ICANN will build an automated test suite test for resolvers bundled with various popular operating systems/distributions. The tests are performed by launching virtual machines and/or containers, and executing tests with the real time and the accelerated 5011 environments. These tests will also be run in ICANN's middlebox test lab.
ICANN has now completed the first step, which is to build operating systems and capture their first outputs on port 53, 80, and 443 to look for evidence of their doing their own resolution and any DNSSEC-related lookups. The results are that only Ubuntu 1604 built with "DNS server" and FreeBSD 10 built with "local unbound" did their own resolution. All the rest (including those built without turning on DNS in the installation process) act as stub resolvers and use the server given to them by DHCP. Only FreeBSD 10 built with "local unbound" did DNSSEC lookup. Ubuntu 1604 built with "DNS server" acted as a recursive server but without DNSSEC.
This investigation tells us that FreeBSD 10 built with "local unbound" should be carefully checked during the KSK rollover. This version uses a recent version of the Unbound resolver and can be tracked in the same way as Unbound itself. New versions of operating system distributions that come out during the rollover process will be tested.